Arrangement for determining position, angle or rotational speed
Abstract
Arrangement for determining a position, an angle and/or a rotational speed by means of a sensor ( 1 ), which has at least one sensor full bridge with two half bridges ( 3, 4 ), and by means of an encoder ( 2; 11 ) with laterally alternating magnet poles, a sinusoidal magnetic field running through the sensor ( 1 ) in the event of a relative movement between the sensor ( 1 ) and encoder ( 2; 11 ) such that the two half bridges ( 3, 4 ) of the sensor ( 1 ) each supply a sinusoidal sensor signal (V 1 , V 2 ), and a sum signal (SUM) and a difference signal (DIFF) being obtained from these signals by means of forming sums and differences, respectively, which are evaluated in order to determine a position, an angle and/or a rotational speed.
Claims
exact text as granted — not AI-modified1 . An arrangement for determining a position, an angle and/or a rotational speed by means of a sensor ( 1 ), which has at least one sensor full bridge, with two half bridges ( 3 , 4 ), and by means of an encoder ( 2 ; 11 ) with laterally alternating magnet poles, a sinusoidal magnetic field running through the sensor ( 1 ) in the event of a relative movement between the sensor ( 1 ) and encoder ( 2 ; 11 ) such that the two half bridges ( 3 , 4 ) of the sensor ( 1 ) each supply a sinusoidal sensor signal (V 1 , V 2 ), and a sum signal (SUM) and a difference signal (DIFF) being obtained from these signals by means of forming sums and differences, respectively, which are evaluated in order to determine a position, an angle and/or a rotational speed.
2 . The arrangement as claimed in claim 1 , wherein a determination of rotational speed is undertaken using means ( 14 ) for determining the zero crossings of the sum signal SUM and/or the difference signal DIFF.
3 . The arrangement as claimed in claim 1 , wherein a magnetized layer with alternating magnet poles is used as encoder ( 2 ; 11 ).
4 . The arrangement as claimed in claim 1 , wherein the spacing (d 1 ) of the two sensor half bridges ( 3 , 4 ) from one another is smaller than the length (λ) of a pair of poles of the encoder ( 2 ; 11 ).
5 . The arrangement as claimed in claim 1 , wherein a counter is provided for counting preferably the zero crossings of the sum signal SUM and/or the difference signal DIFF, such that it is possible to determine the position via a relative movement between sensor and encoder, which is longer than the length (λ) of a pair of poles of the encoder.
6 . The arrangement as claimed in claim 1 , wherein in order to calculate a value of a position or an angle by means of an ARCTAN calculation, the arrangement generates a linear characteristic on which the value is determined, the ARCTAN calculation being performed according to the following equations:
DIFF
:
=
V
1
-
V
2
=
2
*
V
0
*
cos
(
phi
2
)
*
sin
(
ω
t
)
[
1
]
SUM
:
=
V
1
+
V
2
=
2
*
V
0
*
sin
(
phi
2
)
*
sin
(
ω
t
-
90
∘
)
[
2
]
tan
(
α
)
=
DIFF
SUM
=
2
*
V
0
*
cos
(
phi
2
)
*
sin
(
ω
t
)
2
*
V
0
*
sin
(
phi
2
)
*
sin
(
ω
t
-
90
∘
)
=
cos
(
phi
2
)
*
sin
(
ω
t
)
sin
(
phi
2
)
*
-
cos
(
ω
t
)
=
-
tan
(
ω
t
)
tan
(
phi
2
)
where
tan
(
phi
2
)
=
const
.
=
c
[
3
]
α
=
arctan
(
-
tan
(
ω
t
)
c
)
where
c
=
tan
(
phi
2
)
[
4
]
where:
α: is the calculated angle,
V 0 : is the maximum amplitude of the signals V 1 and V 2 ,
V 1 : is the output signal of the first half bridge,
V 2 : is the output signal of the second half bridge,
phi: is the phase offset between the signals V 1 and V 2 , and
ωt: is the circular velocity of the signals V 1 and V 2 .Join the waitlist — get patent alerts
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